RPC服务器不可用。 （来自HRESULT的异常：0x800706BA）-Excel

Question

I tried to write data to a excel template file using asp.net c#. But I got following exception.

ExceptionType: "System.Runtime.InteropServices.COMException" Message: "The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)"

Sometimes it works for small count of rows. I cannot find what is the issue.

try
{

int rowNumber = 5;  

DataSet ds = ClsSystem.getReviewResponse();     

Excel.Application myExcelApplication = null;
Excel.Workbook myExcelWorkbook = null ;
Excel.Worksheet myExcelWorkSheet = null;

//copy template
System.IO.File.Copy(excelFilePath, NewExcelFilePath);

myExcelApplication = new Excel.Application(); 
myExcelApplication.DisplayAlerts = false; 

myExcelWorkbook = (Excel.Workbook(myExcelApplication.Workbooks._Open(NewExcelFilePath, System.Reflection.Missing.Value,
            System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
            System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
            System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
            System.Reflection.Missing.Value, System.Reflection.Missing.Value)); // open the existing excel file

myExcelWorkSheet = (Excel.Worksheet)myExcelWorkbook.Worksheets[1]; 
myExcelWorkSheet.Name = "Test sheet";

for (int n = 0; n < ds.Tables.Count; n++)
    {
        for (int i = 0; i < ds.Tables[n].Rows.Count; i++)
        {

            myExcelWorkSheet.Cells[rowNumber, "A"] = ds.Tables[n].Rows[i]["HeaderID"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "B"] = ds.Tables[n].Rows[i]["ResponseID"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "C"] = ds.Tables[n].Rows[i]["Region"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "D"] = ds.Tables[n].Rows[i]["Sector"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "E"] = ds.Tables[n].Rows[i]["Facility"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "F"] = ds.Tables[n].Rows[i]["Program"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "G"] = ds.Tables[n].Rows[i]["AuditDate"].ToString();
            myExcelWorkSheet.Cells[rowNumber, "H"] = ds.Tables[n].Rows[i]["Auditor1"].ToString();

            rowNumber++;
        }
        rowNumber++;
    }

    try
        {
            myExcelWorkbook.SaveAs(NewExcelFilePath, System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
             System.Reflection.Missing.Value, System.Reflection.Missing.Value, Excel.XlSaveAsAccessMode.xlExclusive,
             System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value,
                System.Reflection.Missing.Value, System.Reflection.Missing.Value); // Save data in excel


            myExcelWorkbook.Close(true, NewExcelFilePath, System.Reflection.Missing.Value); // close the worksheet
            myExcelApplication.Quit();


        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            if (myExcelWorkSheet != null) Marshal.ReleaseComObject(myExcelWorkSheet);

            if (myExcelWorkbook != null) Marshal.ReleaseComObject(myExcelWorkbook);

            if (myExcelApplication != null) Marshal.ReleaseComObject(myExcelApplication);
        }
  }
  catch (Exception ex)
    {
        if (myExcelApplication != null)
        {
            myExcelApplication.Quit(); // close the excel application
        }

        throw ex;
    }

I want to write more than 500 rows at once.

Answer 1

Not to rock the boat on your development path entirely, but I find the interop libraries horribly unreliable. I have had much greater success with ClosedXML. I write tens of thousands of rows a day and have never had an issue related to ClosedXML. https://github.com/ClosedXML/ClosedXML